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-rw-r--r--src/librbd/operation/DisableFeaturesRequest.h171
1 files changed, 171 insertions, 0 deletions
diff --git a/src/librbd/operation/DisableFeaturesRequest.h b/src/librbd/operation/DisableFeaturesRequest.h
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+++ b/src/librbd/operation/DisableFeaturesRequest.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef CEPH_LIBRBD_OPERATION_DISABLE_FEATURES_REQUEST_H
+#define CEPH_LIBRBD_OPERATION_DISABLE_FEATURES_REQUEST_H
+
+#include "librbd/ImageCtx.h"
+#include "librbd/operation/Request.h"
+#include "cls/rbd/cls_rbd_client.h"
+
+class Context;
+
+namespace librbd {
+
+class ImageCtx;
+
+namespace operation {
+
+template <typename ImageCtxT = ImageCtx>
+class DisableFeaturesRequest : public Request<ImageCtxT> {
+public:
+ static DisableFeaturesRequest *create(ImageCtxT &image_ctx, Context *on_finish,
+ uint64_t journal_op_tid,
+ uint64_t features, bool force) {
+ return new DisableFeaturesRequest(image_ctx, on_finish, journal_op_tid,
+ features, force);
+ }
+
+ DisableFeaturesRequest(ImageCtxT &image_ctx, Context *on_finish,
+ uint64_t journal_op_tid, uint64_t features, bool force);
+
+protected:
+ void send_op() override;
+ bool should_complete(int r) override;
+ bool can_affect_io() const override {
+ return true;
+ }
+ journal::Event create_event(uint64_t op_tid) const override {
+ return journal::UpdateFeaturesEvent(op_tid, m_features, false);
+ }
+
+private:
+ /**
+ * DisableFeatures goes through the following state machine:
+ *
+ * @verbatim
+ *
+ * <start>
+ * |
+ * v
+ * STATE_PREPARE_LOCK
+ * |
+ * v
+ * STATE_BLOCK_WRITES
+ * |
+ * v
+ * STATE_ACQUIRE_EXCLUSIVE_LOCK (skip if not
+ * | required)
+ * | (disbling journaling)
+ * \-------------------\
+ * | |
+ * | V
+ * | STATE_GET_MIRROR_MODE
+ * |(not |
+ * | disabling v
+ * | journaling) STATE_GET_MIRROR_IMAGE
+ * | |
+ * | v
+ * | STATE_DISABLE_MIRROR_IMAGE (skip if not
+ * | | required)
+ * | v
+ * | STATE_CLOSE_JOURNAL
+ * | |
+ * | v
+ * | STATE_REMOVE_JOURNAL
+ * | |
+ * |/-------------------/
+ * |
+ * v
+ * STATE_APPEND_OP_EVENT (skip if journaling
+ * | disabled)
+ * v
+ * STATE_REMOVE_OBJECT_MAP (skip if not
+ * | disabling object map)
+ * v
+ * STATE_SET_FEATURES
+ * |
+ * v
+ * STATE_UPDATE_FLAGS
+ * |
+ * v
+ * STATE_NOTIFY_UPDATE
+ * |
+ * v
+ * STATE_REALEASE_EXCLUSIVE_LOCK (skip if not
+ * | required)
+ * | (unblock writes)
+ * v
+ * <finish>
+ *
+ * @endverbatim
+ *
+ */
+
+ uint64_t m_features;
+ bool m_force;
+
+ bool m_acquired_lock = false;
+ bool m_writes_blocked = false;
+ bool m_image_lock_acquired = false;
+ bool m_requests_blocked = false;
+
+ uint64_t m_new_features = 0;
+ uint64_t m_disable_flags = 0;
+ uint64_t m_features_mask = 0;
+
+ decltype(ImageCtxT::journal) m_journal = nullptr;
+ cls::rbd::MirrorMode m_mirror_mode = cls::rbd::MIRROR_MODE_DISABLED;
+ bufferlist m_out_bl;
+
+ void send_prepare_lock();
+ Context *handle_prepare_lock(int *result);
+
+ void send_block_writes();
+ Context *handle_block_writes(int *result);
+
+ Context *send_acquire_exclusive_lock(int *result);
+ Context *handle_acquire_exclusive_lock(int *result);
+
+ void send_get_mirror_mode();
+ Context *handle_get_mirror_mode(int *result);
+
+ void send_get_mirror_image();
+ Context *handle_get_mirror_image(int *result);
+
+ void send_disable_mirror_image();
+ Context *handle_disable_mirror_image(int *result);
+
+ void send_close_journal();
+ Context *handle_close_journal(int *result);
+
+ void send_remove_journal();
+ Context *handle_remove_journal(int *result);
+
+ void send_append_op_event();
+ Context *handle_append_op_event(int *result);
+
+ void send_remove_object_map();
+ Context *handle_remove_object_map(int *result);
+
+ void send_set_features();
+ Context *handle_set_features(int *result);
+
+ void send_update_flags();
+ Context *handle_update_flags(int *result);
+
+ void send_notify_update();
+ Context *handle_notify_update(int *result);
+
+ void send_release_exclusive_lock();
+ Context *handle_release_exclusive_lock(int *result);
+
+ Context *handle_finish(int r);
+};
+
+} // namespace operation
+} // namespace librbd
+
+extern template class librbd::operation::DisableFeaturesRequest<librbd::ImageCtx>;
+
+#endif // CEPH_LIBRBD_OPERATION_DISABLE_FEATURES_REQUEST_H